What is a "Catch All" e-mail Address?

If an email address has been marked as '*Catch All*' then that email account will not only collect email for mail sent to the email address, but for any other mail sent to the domain that does not have a appropriate email account or email forward set up for. For example if a mail was sent to anythiing@mydomain.com and this address was not setup for a specific account, then the 'Catch All' email account will collect this mail instead.

What is an "E-mail Auto Responder"?

An auto responder, otherwise known as vacation message, gives the means to respond to any email addresses sent to the email address without any intervention. It is common practive by many people to use them when they are unable to answer emails for a prolonged period. A message is sent back to the sender of the format you choose.

What is "E-mail Forwarding"?

E-mail Forwarding is simply an e-mail address which automatically fowards all mail to another designated e-mail address.